Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1343 (ENGINE CONTROL SYSTEM (INTRODUCTION) -- 1.8L (LNK))REPAIR INSTRUCTIONSTHROTTLE BODY ASSEMBLY REPLACEMENTREMOVAL PROCEDURE

2003 Chevrolet TrailBlazer 4.2 S, 4WD

Removal Procedure

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Removal Procedure

WARNING: This page is about a different car, the 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: View Of Engine Upper Cover

Courtesy of GENERAL MOTORS CORP.

Remove the 4 fasteners from the engine cover (1).
Remove the engine cover (1) from the engine.

Fig 2: Throttle Body Components

Courtesy of GENERAL MOTORS CORP.

Remove the air inlet duct (2) from the throttle body assembly (1).
Remove the positive crankcase ventilation (PCV) breather hose (6).
Remove the throttle position (TP) sensor connector (4).
Rotate the throttle lever and disconnect the accelerator cable and the throttle valve cable, if equipped.
Disconnect the electrical connector (5) of the idle air control (IAC) valve.
Drain the cooling system. Refer to Draining and Filling Cooling System in Engine Cooling.
Remove the 2 coolant hoses (3) from the throttle body.

Fig 3: Throttle Body, Gasket, Cable Bracket, Nuts And Bolts

Courtesy of GENERAL MOTORS CORP.

Remove the 2 throttle body nuts (3) and the accelerator control cable bracket (4).
Remove the 2 throttle body bolts (5).
Remove the throttle body (2) and the gasket (1) from the intake manifold.

Fig 4: Throttle Body Gasket

Courtesy of GENERAL MOTORS CORP.

Clean any remaining throttle body gasket (1) from the intake manifold.

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.